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(C) The reaction is an intramolecular aldol condensation of heptane$-2,6-$dione. $1$. The base $OEt^-$ abstracts an $\alpha$-hydrogen from one of the

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(C) The reaction is an intramolecular aldol condensation of heptane$-2,6-$dione. $1$. The base $OEt^-$ abstracts an $\alpha$-hydrogen from one of the terminal methyl groups to form an enolate. $2$. The enolate carbon attacks the other carbonyl carbon,forming a five-membered ring (intramolecular aldol addition). $3$. This results in a $\beta$-hydroxy ketone intermediate. $4$. Upon heating $(\Delta)$,the intermediate undergoes dehydration (elimination of water) to form the stable $\alpha,\beta$-unsaturated ketone,which is $3$-methylcyclopent-$2$-en-$1$-one derivative.

$A$ in the above reaction is:

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